工作面贯通前矿压调整时剩余煤柱稳定性分析

Stability analysis of un-mined coal pillars during the pressure adjustment prior to working face transfixion

为避免工作面贯通及回撤过程中顶板再次来压,保证回撤通道围岩稳定,首先分析贯通前不同矿压调整措施的适用条件,在此基础上建立末采剩余煤柱力学分析模型,求解得出煤柱临界宽度与围岩赋存条件及物理力学参数、工程相关参数及末采基本顶破坏形式等相关参数的函数关系式。经过分析发现,基本顶断裂位置、工作面埋深、岩层性质以及采煤高度等对末采阶段巷道围岩稳定性控制起到关键作用,在贯通前采取矿压调整,特别需要进行停采调整时,应对上述主要影响因素给予充分考虑,保证停采过程中煤柱稳定性。

To avoid roof weighting during the working face transfixion and equipment returning, and to ensure the surrounding rock stability of the equipment remove gateway, the applicable conditions of pressure adjustment measures prior to working face transfixion were analyzed, based on which the me- chanical model of un-mined coal pillar in terminal mining was established. According to the model ob- tained, the function relation has been established between coal pillar width and of critical occurrence conditions and the mechanical parameters of surrounding rock, engineering parameters, or the destruc- tion form of main roof prior to transfixion. The results have shown that the key factors influencing the stability of surrounding rock in end-mining are the fault location of main roof, the overlay stratum thickness, and the nature of the strata and the mining height, etc. Therefore, during the non-mining pe- riod the adjustment measures should be taken to adjust the mining pressure prior to transfixion, and we should give full consideration to the key influencing factors to ensure the stability of the un-mined coal pillars.